Plastic Frame, Display Device and Assembling Method Thereof

1. A plastic frame, including: a limiting part, formed into a shape of rectangle and defining an area for fixing a display screen; and a supporting part, extending perpendicularly to the limiting part to support the display screen, the display screen including a first panel and a second panel which is laminated to the first panel, wherein the first panel is a raster panel and the second panel is a display panel, the plastic frame further includes a fixing unit arranged between the limiting part and the display screen, and a fixing surface of the fixing unit is in contact with side surfaces of the first panel and the second panel, wherein the fixing unit includes a first wedge block and a second wedge block, each of the first wedge block and the second wedge block being formed in a triangle shape having a bottom surface and an inclined surface, the inclined surface of the second wedge block is able to be in contact with the inclined surface of the first wedge block, a plurality of zigzag protrusions are provided on the inclined surface of the first wedge block and the inclined surface of the second wedge block, tips of the zigzag protrusions on the inclined surface of the first wedge block being arranged in an insert direction of the second wedge block, while tips of the zigzag protrusions on the inclined surface of the second wedge block being arranged in a direction opposite to the insert direction, and when the second wedge block is inserted into a clearance between the first wedge block and the display screen along the insert direction, the zigzag protrusions are not able to interfere with the movement of the second wedge block along the insert direction; and when the second wedge block is seated, the zigzag protrusions are able to prevent the second wedge block from sliding with respect to the first wedge block.

2. The plastic frame according to claim 1 , wherein the first panel is arranged on a light emitting side of the display screen with respect to the second panel.

3. The plastic frame according to claim 1 , wherein the bottom surface of the first wedge block is fixed to a side surface of the limiting part directing towards the display screen or formed integrally with the limiting part, and the inclined surface of the first wedge block is directed towards a side surface of the first panel.

4. The plastic frame according to claim 3 , wherein the inclined surface of the second wedge block is in contact with the inclined surface of the first wedge block, while the bottom surface of the second wedge block is in contact at least with the side surface of the first panel.

5. The plastic frame according to claim 4 , wherein each of the first wedge block and the second wedge block is in a right triangle shape.

6. The plastic frame according to claim 3 , wherein opposite sides of the limiting part are provided with the fixing units.

7. A display device, wherein the display device includes the plastic frame according to claim 1 .

8. The display device according to claim 7 , wherein the bottom surface of the first wedge block is fixed to a side surface of the limiting part directing towards the display screen or formed integrally with the limiting part, and the inclined surface of the first wedge block is directed towards a side surface of the first panel.

9. The display device according to claim 8 , wherein the inclined surface of the second wedge block is in contact with the inclined surface of the first wedge block, while the bottom surface of the second wedge block is in contact at least with the side surface of the first panel.

10. The display device according to claim 9 , wherein each of the first wedge block and the second wedge block is in a right triangle shape.

11. The display device according to claim 9 , wherein the side surface of the second wedge block directing towards a light emitting direction of the display screen is flush with an outer surface of the first panel.

12. The display device according to claim 9 , wherein the display screen includes a display region and a non-display region around the display region; the display device further includes a front frame for fixing the plastic frame and the display screen, a cross section of the front frame is formed in an L-shape and has an upright part and a folded part, and the upright part is arranged to surround a periphery of the plastic frame while the folded part is configured to cover the non-display region of the display screen; and adhesives are provided between the side surface of the second wedge block directing towards the folded part and the folded part.

13. An assembling method of a display device, wherein the assembling method includes: arranging a display screen in an area defined by a limiting part of a plastic frame and supporting it by a supporting part of the plastic frame, wherein the display screen includes a first panel and a second panel that is laminated to the first panel, the first panel being a raster panel and the second panel being a display panel; and interposing a fixing unit into a clearance between the limiting part and the display screen, such that a fixing surface of the fixing unit is in contact with side surfaces of the first panel and the second panel, wherein the fixing unit includes a first wedge block and a second wedge block, each of the first wedge block and the second wedge block being formed in a triangle shape having a bottom surface and an inclined surface, the inclined surface of the second wedge block is able to be in contact with the inclined surface of the first wedge block, a plurality of zigzag protrusions are provided on the inclined surface of the first wedge block and the inclined surface of the second wedge block, tips of the zigzag protrusions on the inclined surface of the first wedge block being arranged in an insert direction of the second wedge block, while tips of the zigzag protrusions on the inclined surface of the second wedge block being arranged in a direction opposite to the insert direction, and when the second wedge block is inserted into a clearance between the first wedge block and the display screen along the insert direction, the zigzag protrusions are not able to interfere with the movement of the second wedge block along the insert direction; and when the second wedge block is seated, the zigzag protrusions are able to prevent the second wedge block from sliding with respect to the first wedge block.

14. The assembling method according to claim 13 , wherein the bottom surface of the first wedge block is fixed to a side surface of the limiting part directing towards the display screen or formed integrally with the limiting part, the step of interposing the fixing unit into the clearance between the limiting part and the display screen further includes: in the case that the inclined surface of the second wedge block faces to the inclined surface of the first wedge block, interposing the second wedge block into a clearance between the first wedge block and the display screen, such that the inclined surface of the second wedge block is in contact with the inclined surface of the first wedge block while the bottom surface of the second wedge block is in contact at least with the side surface of the first panel of the display screen.

15. The assembling method according to claim 14 , wherein after the step of interposing the second wedge block into the clearance between the first wedge block and the display screen, the assembling method further includes: mounting a front frame around the plastic frame in an adhesive manner, wherein a cross section of the front frame is formed in an L-shape and has an upright part and a folded part, the upright part being arranged to surround a periphery of the plastic frame while the folded part being configured to cover a non-display region of the display screen.